Striped raid What is it.

  Bagsey 08:05 06 Nov 2004

As someone who has been into video editing for a long time I came accross someone talking about a striped raid hdd. Can some body please explain to me just what that is,means etc. Also how would it be an advantage to have it for video editing. Thanks in advance for any help on this.

  bremner 08:36 06 Nov 2004

click here for an explanation of Raid 0.

It is good for video editing as it allows fast writing to disk.

The downside is that if any one of the (minimum two) disks fails you have lost all your data.

  Forum Editor 09:04 06 Nov 2004

is an acronym - the computer industry loves them so much - for Redundant Array of Independent (or Inexpensive) Disks. RAID was originally designed so that an 'array' of small drives would appear to the operating system as one, large logical drive.

'Striping' is a process whereby data is split into blocks and written to more than one drive. The drives are divided into many partitions (stripes) of widely varying sizes, and these are shuffled, rather like a deck of cards, so that the resulting storage space is made up of alternating stripes from two or more drives.

There are many different RAID levels - most of them of no interest to the home user, and it can get complicated. You are most likely to encounter three RAID levels:-

RAID Level 0 is not redundant, so it does not truly fit the "R" part of the "RAID" acronym. In level 0, data is split across drives, resulting in higher data throughput. Since no redundant information is stored, performance is very good, but the failure of any disk in the array results in data loss. This level is commonly referred to as striping.

RAID Level 1 provides redundancy by writing all data to two or more drives. The performance of a level 1 array tends to be faster on reads and slower on writes compared to a single drive, but if either drive fails, no data is lost. This is a good entry-level redundant system, since only two drives are required; however, since one drive is used to store a duplicate of the data, the cost per megabyte is high. This level is commonly referred to as mirroring.

RAID Level 5 Provides data striping at the byte level and also stripe error correction information. This results in excellent performance and good fault tolerance. Level 5 is one of the most popular implementations of RAID.

Does that help at all?

  bremner 09:09 06 Nov 2004

The only draw back for the home user is that RAID 5 needs a minimum of three disks.

  Bagsey 13:27 06 Nov 2004

Thanks very much for you help on this and to FE for taking the time to write a very concise explanation. I am now equiped to go away and do some more study. Again many thanks.

  Bagsey 13:31 06 Nov 2004

Sorry! but I meant to say thanks for that link. It is indeed a very good source for further study.

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